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Overspeed |
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Overspeed
(or racing), an abrupt spontaneous increase in the rate of shaft rotation of an internal-combustion engine that can lead to destruction of the engine. It is caused by a substantial increase in the supply of fuel-air mixture or fuel to the engine’s cylinders with light external loading, which occurs upon failure of the throttle valve in carburetor engines or of the high-pressure fuel injection pump in diesel engines. In two-cycle supercharged diesel engines, overspeed can also occur when the amount of oil entering the cylinders from the air filter is increased. At the first signs of overspeed, the fuel supply is cut off and a load is applied to the engine; some diesel engines are equipped with an emergency-stop device, which shuts off the air supply to the cylinders. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | An optional diesel engine exhaust spark arrestor is a basic but key safety feature for hazardous area applications and should the engine begin to accelerate due to volatile vapours in the atmosphere, an optional overspeed valve closes the air intake to the engine, to prevent damage. Road near Ahmedabad due overspeed and overloading, killing 6 people while two other were taken out from the Nullah alive. Jul 15, 2009 Northwest Airlines, Airbus A preliminary report by the US National Transportation Safety Board into a 23 June incident involving airspeed fluctuations on a Northwest Airlines Airbus A330 flight from Hong Kong to Tokyo says the flight data recorder confirmed large airspeed fluctuations, small altitude fluctuations and an overspeed alertat 39,000ft (11,900m) roughly 80km (45nm) south-west of Kagoshima, Japan. |
Overspeed |
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